The 29-year-old Manning marched in New York City's Pride event on Sunday as part of the American Civil Liberties Union's (ACLU) contingent. The ACLU, which represents Manning in her lawsuit against the government over prison conditions, tweeted an image of her with the words: "Happy first Pride March, Chelsea Manning!"

Manning, who came out as transsexual in 2013, later tweeted a picture of herself in a convertible next to Gavin Grimm, a transgender teen from Virginia who sued his school district for denying him access to the boys' restroom. "Lost my voice from screaming so much" Manning wrote.